Quebec City police are investigating a package of hateful messages left in front of the mosque where six people were murdered earlier this year.

The package contained what police are calling "heinous allusions" regarding the weekend referendum about creating a cemetery for Muslims in Saint-Apollinaire, near Quebec City.

Police said the package was delivered on Friday to the Quebec City Islamic Cultural Centre, and is just the latest in a string of threatening messages delivered online and in person to the site for years.

Members of the mosque informed police, but asked that they not publicize the delivery of the package because they did not want to affect the weekend referendum.

The secretary of the mosque discovered the package and said it included a copy of the Koran with an 'X' cut into it, along with multiple hateful messages alongside an image of pigs in mud.

Mohamed Labidi, the mosque's president, said the attitude on display is disgraceful.

"We are very astonished about that and very upset, very angry that some people think so bad and have these kind of heinous and bad attitude about Muslims and our community," said Labidi. “Especially after what happened in January, and in our mosque that has become a symbol for all the Muslims around Canada.”

For now, police don't have a suspect, and even if they do find the person they believe is responsible, at this point they say it's too early to determine whether there are grounds for criminal charges.

“We have to not only prove that there was an action made, a criminal action, but we have to prove the intention,” explained David Poitras, spokesperson for the Quebec City police.

Premier Philippe Couillard is trying to reassure Muslims, saying, “It's more than troubling, it's unacceptable and repulsive.”

Last year someone left a pig's head in front of the mosque with a note reading "Bon Appetit" -- a reference to the Koran's prohibition of consuming pork.

"We should all condemn these acts, they're not unique to Quebec, we see this around the world where communities co-exist," said Couillard. "The true attitude, we saw it after the attack when thousands of people from Quebec City went in the street claiming their friendship and affection for their Muslim neighbours."

Speaking in Quebec City Wednesday, Prime Minister Justin Trudeau also condemned the act, saying it has nothing to do with Canadian values.

“When we had that terrible attack last January at the mosque, I saw myself how 10,000 people came out on the streets to recognize that the hateful act does not represent Quebecers or Canadians,” he said. "In any society, there will be people who are intolerant or racist and I think the challenge of a strong society is to spend our time focusing on where we are similar and not where we are different...We consider it to be an attack that is outside of our values and our way of living."

In January a gunman walked into the mosque during Sunday evening prayers and opened fire.Alexandre Bissonnette is facing six charges of first-degree murder and five counts of attempted murder.

According to Islamic tradition Muslims should be buried in a cemetery operated by Muslims, and there is no such cemetery in the Quebec City region.

Three victims of the January shooting were buried in Montreal, and the remains three others were returned to their countries of birth.

Following the mass murder in January, the Quebec Islamic Centre reached an agreement to purchase a 60,000 square foot plot of land from the Harmonia funeral home to create the region's first Islamic cemetery.

Members of the mosque said they are committed Quebecers, and as such want to be buried at home.

However a handful of Saint-Apollinaire residents rejected the idea -- enough to force a referendum among four dozen people who live near the existing funeral home.

On Sunday, 19 people voted against the project, while 16 voted in favour. That rejection prompted the mayor of Quebec City and Quebec's premier to issue messages saying they were disappointed with the result.